Journal of Textile Research ›› 2019, Vol. 40 ›› Issue (8): 48-54.doi: 10.13475/j.fzxb.20180606907

• Textile Engineering • Previous Articles     Next Articles

Numerical simulation on low velocity impact response of three-dimensional sandwich composites with different core height

LUO Chao, CAO Haijian(), HUANG Xiaomei   

  1. School of Textile and Clothing, Nantong University, Nantong, Jiangsu 226019, China
  • Received:2018-06-25 Revised:2019-04-11 Online:2019-08-15 Published:2019-08-16
  • Contact: CAO Haijian E-mail:caohaijian@ntu.edu.cn

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Abstract:

In order to study the mechanical response and damage mechanism of the three-dimensional sandwich composites at low velocity, a microstructural model of three-dimensional sandwich composites with different core material heights was established for simulation by means of the ANSYS finite element software, and the simulated values were compared with the experimental values. The results show that the low velocity impact resistance of the sandwich composite material increases with the increase of the core material height from the macroscopic angle, and the damage of the material with the height of 5 mm is more serious when the upper plate is damaged, and the simulation results have a good consistency with the experimental results. From the microscopic perspective, the warp, weft and junction warp are the main bearing bodies, and the resin matrix plays a secondary role. Under the impact of 5 J energy, the main failure modes of the material are resin deformation, fragmentation and fiber debonding.

Key words: three-dimensional sandwich composite, low velocity impact, core height, finite element method

CLC Number: 

  • TU599

Fig.1

Three-dimensional sandwich fabrics (a) and its composites (b)"

Fig.2

Material structure model with core height of 5 mm. (a) Fabric structure model;(b) Resin structure model; (c) Composite material structural model"

Tab.1

Model material parameters"

材料 弹性模量/
GPa		 密度/
(g·cm-3)		 拉伸强度/
GPa		 泊松比
玻璃纤维 70 2.50 3.00 0.25
环氧树脂 1 1.20 0.07 0.38
结构钢 200 7.85 0.46 0.30

Fig.3

Structure model of two core materials height"

Fig.4

Stress map of lower panel of whole model of two core material height. (a) Top panel of 5 mm; (b) Top panel of 10 mm; (c) Core material of 5 mm; (d) Core material of 10 mm; (e) Lower panel of 5 mm; (f) Lower panel of 10 mm"

Fig.5

Surface topography of two kinds of materials after low velocity impact. (a) Upper surface topography of 5 mm; (b) Upper surface topography of 10 mm;(c) Lower surface topography of 5 mm; (d) Lower surface topography of 10 mm; (e) Core material topography of 5 mm; (f) Core material topography of 10 mm;(g) Morphology of local damage of material core;(h) Topography of local surface damage on materials"

Fig.6

Low speed impact response of two materials at 5 J energy"

Fig.7

Stress cloud of each component of two materials. (a) Resin model of 5 mm;(b) Resin model of 10 mm; (c) Connection yarn model of 5 mm; (d) Connection yarn model of 10 mm; (e) Warp model of 5 mm; (f) Warp model of 10 mm; (g) Weft model of 5 mm; (h) Weft model of 10 mm"

Fig.8

Strain cloud map of the two materials. (a) Overall model of 5 mm; (b) Overall model of 10 mm; (c) Resin model of 5 mm; (d) Resin model of 10 mm; (e) Fabric model of 5 mm; (f) Fabric model of 10 mm"

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